<!DOCTYPE HTML>
<html>
<head>
    <meta charset="UTF-8">
    <title>Test My WebSocket</title>
</head>


<body>
Test<br/>

<input type="text" id="user" value="">
<button onclick="connect()">连接</button>
<br/>
<input id="text" type="text" />
<button οnclick="send()">Send</button>



<button οnclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>


<script type="text/javascript">
    var websocket = null;

    function connect(){
        var user = document.getElementById("user").value;
        //判断当前浏览器是否支持WebSocket
        if('WebSocket' in window){
            //连接WebSocket节点
            websocket = new WebSocket("ws://localhost:8006/interface/websocket/"+user);
        }
        else{
            alert('Not support websocket')
        }

        //连接发生错误的回调方法
        websocket.onerror = function(){
            setMessageInnerHTML("error");
        };


        //连接成功建立的回调方法
        websocket.onopen = function(event){
            setMessageInnerHTML("open");
        }


        //接收到消息的回调方法
        websocket.onmessage = function(event){
            setMessageInnerHTML(event.data);
        }

        //连接关闭的回调方法
        websocket.onclose = function(){
            setMessageInnerHTML("close");
        }
    }
    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML){
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket(){
        if(websocket==null){
            alert("请先进行连接")
        }
        websocket.close();
    }
    //发送消息
    function send(){
        if(websocket==null){
            alert("请先进行连接")
        }
        var message = document.getElementById('text').value;
        websocket.send(message);
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function(){
        websocket.close();
    }
</script>
</html>